flash not linking correctly through a text file

I have a website with a flash intro, after the flash intro finishes playing it shows a button within flash to enter the website. since we were changing the link to the enter page while testing, we asked the flash developer to give us an easy way to change where the button links to.

and we should be able to change home to reflect the page we want to show.

this worked fine on the localhost. but when uploaded to the server it didn't work correctly and instead it was linking to an "undefined" page like this: http://www.mysite.com/undefined and of course showing page not found error.

i want to mention also that the flash file is located in a subfolder with the txt file and the page we link to is on an upper level. we tried relative and full path, both worked on localhost but not on hosting server.

Is the mysite.com your website?
The server you uploaded flash file is IIS or Apache?
If Apache did you make necessary configuration to support ASP?
The mysite.com has URL address masking which may conflict with your direct request for "aspx" document, was the flash designer aware of it?
Lastly it would be worth to have inside view on flash source file "fla" to check on the coding